Therefore, you will experience a slow network speed when the icon is either G, E or 3G; and you will experience a smooth network speed when the icon is H or 4G.

Note that most of the phones released earlier than 2012 are not supporting 4G Internet connection yet, and most handphone does not support HSUPA. HSUPA is more commonly used for home/office Internet broadband connected with wireless router device.

Both the phone and also the mobile operator's network infrastructure must support the network type in order for such Internet connection to be established for the phone.